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Sub-microWatt threshold nanoisland lasers.

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  • 1Department of Physics, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Republic of Korea.

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Area of Science:

  • Photonics
  • Optoelectronics
  • Materials Science

Background:

  • Nanolasers are crucial for power-efficient light sources in photonic integrated circuits.
  • Existing nanolasers face challenges in achieving ultralow thresholds and miniaturization.

Purpose of the Study:

  • To propose and demonstrate a single-cell nanobeam laser utilizing a nanoisland quantum well.
  • To achieve continuous-wave operation at room temperature with an ultralow lasing threshold.

Main Methods:

  • Fabrication of a single-cell nanobeam laser with a reduced active medium size (0.7 × 0.25 × 0.02 μm³).
  • Integration of a nanoisland quantum well within the nanobeam cavity.
  • Utilizing thick InP slabs (420 nm) for enhanced thermal and mechanical stability.

Main Results:

  • Achieved continuous operation at 1.5 μm wavelength at room temperature.
  • Demonstrated an ultralow lasing threshold of 210 nW in absorbed power.
  • Successfully reduced the active medium size by removing surrounding absorptive quantum well regions.

Conclusions:

  • The nanoisland-based nanolaser offers a new platform for engineering light-matter interactions.
  • This design enables the realization of highly efficient nanophotonic devices.
  • The achieved ultralow threshold and miniaturization are significant advancements for integrated photonics.